995 results about "Open cell" patented technology

Ground-engaging components for articles of footwear include an outer perimeter boundary rim that at least partially defines an outer perimeter of the ground-engaging component, wherein the outer perimeter boundary rim defines an upper-facing surface and an opposite ground-facing surface. The outer perimeter boundary rim defines an open space at least at a forefoot support area of the ground-engaging component. A matrix structure extends from the outer perimeter boundary rim (e.g., the ground-facing surface and / or the upper-facing surface) and across the open space at least at the forefoot support area to define an open cellular construction with plural open cells across the open space at least at the forefoot support area. The matrix structure defines one or more sets of adjacent open cells, the set(s) including at least three open cells that are substantially aligned in the forefoot support area along a line extending in a forward medial-to-rear lateral direction.

The invention relates to the technical field of chip embedded module packaging, in particular to a blind hole processing method and a substrate. An embedded chip substrate is prepared, a chip is embedded in the embedded chip substrate, and the chip is covered with an insulating layer; determining a hole opening position on the insulating layer, wherein the hole opening position corresponds to the embedding position of the chip on the chip embedding substrate; laser ablation is conducted on the hole opening position through ultraviolet laser according to preset laser parameters, so that an initial blind hole is machined in the hole opening position; and performing residue removal processing on the initial blind hole through plasma equipment to obtain a target blind hole. Therefore, the initial blind hole is machined in the hole opening position through the ultraviolet laser, molecular bonds can be directly destroyed, cold ablation is achieved and thermal damage is reduced on the basis of the characteristic that photon energy of the ultraviolet laser is high, meanwhile, the target blind hole with the smooth hole wall can be obtained by conducting residue removing treatment on the initial blind hole through plasma equipment, and the hole opening precision is improved. Compared with the prior art, high-precision and high-quality machining of the blind hole is achieved.

The invention relates to a solid-state battery positive electrode material layer and a solid-state battery, belongs to the technical field of solid-state batteries, and is used for solving at least one of the problems that an existing solid-state battery is easy to crack, poor in contact and large in resistance, and a solid-state electrolyte battery prepared by a physical vapor deposition method is thin in electrode thickness, low in capacity and the like. A plurality of holes are formed in the positive electrode material layer, the diameter of each hole is 0.1-10 [mu] m, the opening area of each hole in the unit area of the positive electrode material layer accounts for 20-60% of the total area, and each hole is of a through hole structure. The positive electrode material layer of the solid-state battery is provided with a plurality of holes with through hole structures, the solid electrolyte is embedded into the holes, the holes are filled with the solid electrolyte, the solid electrolyte covers the positive electrode material layer, and the holes have specific diameters and opening areas, so that the ionic conductivity is improved, and the service life of the solid-state battery is prolonged. The thickness of the prepared positive electrode material layer can be designed as required.

The present invention discloses a wireless ultrasonic measurement system and a construction method thereof, wherein the measurement system includes a sensing module and a detection module; the sensing module includes a piezoelectric layer on the surface of the detection object, a first lead-out electrode structure, a first grounding electrode structure, a first insulating plate, and a sensing coil; the first insulating plate is provided with a first opening; the first lead-out electrode structure includes a first lead-out electrode on the top of the piezoelectric layer and a second lead-out electrode in the first opening; the first grounding electrode structure includes a first grounding electrode and a second grounding electrode; the second lead-out electrode and the second grounding electrode are respectively connected to the first lead-out electrode and the first grounding electrode; the sensing coil is provided at the top of the first insulating plate. The detection system of the present invention uses an insulating plate to isolate the sensing coil away from the surface of the detection object, which is conducive to the sensing coil generating a non-zero induced voltage U ind , thereby enhancing the signal of the receiving coil, and realizing contactless ultrasonic signal reception with a receiving distance of up to 20mm.

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. The battery cell cover plate comprises a pole and a cover plate, wherein the pole comprises a pole body part and a plate body part, and the pole body part penetrates through a mounting hole of a cover plate main body; the terminal post is riveted with the riveting piece, so that the circumferential side wall of part of the post body part expands outwards to form a material expansion part; the section, perpendicular to the axis of the pole, of the pole forms a strip-shaped structure, K is equal to (1 / 3-2 / 3) L, and M is equal to (1 / 3-2 / 3) W. The section, perpendicular to the axis of the pole, of the pole is of the strip-shaped structure, so that compared with a traditional cylindrical pole structure, the pole has the advantages that the overflowing capacity is improved, and the size proportion relation between the pole body part and the plate body part of the pole is defined as K = (1 / 3-2 / 3) L and M = (1 / 3-2 / 3) W, so that the overflowing capacity of the pole is effectively improved; and the structural strength of the cover plate main body is not influenced by the opening size of the mounting hole, so that the structural strength of the battery cell cover plate meets the battery cell use requirement.

The present invention relates to the field of semiconductors. Provided are a semiconductor structure and a preparation method therefor, and an electronic device, which are used for simplifying semiconductor structures and preparation methods therefor. The preparation method for the semiconductor structure comprises: forming 2n stacked material layer groups (2101) on a first substrate (100), wherein each stacked material layer group (2101) comprises a first material film layer (2111) and a second material film layer (2121); forming n first openings (10) with different depths, and among the first openings (10) from shallow to deep, forming first isolation layers (310) at ends of the first (i-1) first material film layers (2111) penetrated by the ith first opening (10); forming a second opening (20) below each first opening (10), and forming second isolation layers (320) at ends of the first (n-1) first material film layers (2111) penetrated by each second opening (20); and below each second opening (20), forming a third opening (30) extending to the first substrate (100), and forming third isolation layers (330) at ends of the first material film layers (2111) penetrated by each third opening (30).

The invention relates to the technical field of noise treatment, and discloses a composite sound absorption and insulation device which comprises a cavity, a Fabry-Perot resonance structure, gradient structure sound absorption felt, two-dimensional dot matrix scatterer sound insulation rubber and a cover plate. An opening is formed in one side of the cavity, and the two-dimensional dot matrix scatterer sound insulation rubber, the gradient structure sound absorption felt, the Fabry-Perot resonance structure and the cover plate are sequentially arranged at the bottom of the cavity in the direction towards the opening. Wherein an opening is formed in the middle of the top of the cover plate; the Fabry-Perot resonance structure comprises a micro-perforated plate and a space coiling channel, and the micro-perforated plate is arranged right above an opening of the space coiling channel and penetrates through the cover plate to be matched with the opening of the cover plate, so that the cover plate covers the rest part of the space coiling channel; through the combination of a plurality of advanced sound absorption and insulation structures, the low-frequency noise of 100Hz and frequency multiplication of the transformer substation is effectively treated.

The invention discloses a BIM (Building Information Modeling)-based suspended ceiling advanced accurate positioning and trepanning construction method, which comprises the following steps of: S1, establishing a construction model of each specialty in a suspended ceiling, performing collision inspection, and adjusting the construction model; s2, establishing a three-dimensional model including suspenders, keels and the like by utilizing BIM software; s3, comprehensive collision inspection is carried out, and the ceiling structure is prevented from conflicting with other professional equipment; s4, generating a construction drawing and organizing field implementation according to comprehensive suspended ceiling deepening typesetting; s5, a trepanning positioning plate is manufactured, and the trepanning positioning plate is used for accurately positioning the trepanning point position of the veneer plate on site; s6, paying off the trepanning point, confirming a central point and implementing accurate trepanning; and S7, after trepanning is completed, point location installation is conducted on facility equipment needing to be installed in advance. Advanced coordination of the keel in the suspended ceiling and various equipment point positions can be achieved, precise positioning of suspended ceiling trepanning is achieved, disassembly and rework are reduced, and the construction precision and efficiency are improved.

The invention provides an automatic disassembling and recycling system and method for waste electric energy meters, the system comprises a disassembling line and a PCB panel and further comprises a junction box on the PCB panel, the disassembling line is provided with a disassembling device, the disassembling device comprises a first processing platform and a second processing platform which are arranged on the disassembling line, and the first processing platform and the second processing platform are arranged on the PCB panel. The top end of the first processing platform and the top end of the second processing platform are each provided with an adjusting rail and a machining platform, and each machining platform is provided with a lifting assembly, a positioning assembly, a conversion assembly, a collection assembly, a transfer assembly, an air inlet assembly, an air outlet assembly, a limiting assembly and an output assembly. And the discharged electric energy is collected and used for doing work, and the collected electric energy is used for tapping the capacitor and collecting electrolyte, so that the safety on a disassembly line is greatly improved, and meanwhile, pollution is reduced.

The invention is suitable for the technical field of solar cells, and provides a cell module and a photovoltaic system, and the cell module comprises a back contact cell which comprises a first polarity grid line and a second polarity grid line; the plurality of first welding strips and the plurality of second welding strips are respectively connected with the first polarity grid line and the second polarity grid line; the insulating strip is arranged on the sides, deviating from the back contact battery, of the first welding strip and the second welding strip, and the insulating strip comprises a through hole; the bus bar is arranged on the side, away from the back contact battery, of the insulating strip, the bus bar is electrically isolated from the first welding strip through the insulating strip, and the bus bar is electrically connected with the second welding strip through the through hole; wherein the insulating strip is a flexible insulating strip and comprises an open hole part and a non-open hole part, the through hole is located in the open hole part, and the thickness of the open hole part is larger than that of the non-open hole part. According to the flexible insulating strip, the thicker opening part is arranged in the flexible insulating strip, so that a buffering effect is achieved during welding and subsequent lamination, and the risk of subfissure and fragment is reduced.

The invention relates to the technical field of batteries, in particular to a silicon-carbon negative electrode material and a lithium ion secondary battery. The silicon-carbon negative electrode material comprises silicon-carbon particles, the silicon-carbon particles comprise a matrix, and the matrix comprises a porous carbon matrix and silicon particles located in internal holes of the porous carbon matrix; the porous carbon substrate is provided with open pores and closed pores, the open pores contain silicon particles, the closed pores contain an element K, and based on the total mass of the silicon carbon particles, the mass content of the element K is 50 ppm to 1000 ppm; the silicon-carbon particles comprise halogen, and based on the total mass of the silicon-carbon particles, the mass content of the halogen is 50 ppm to 2000 ppm; the silicon carbon particles and deionized water are mixed according to the mass ratio of 1: 10 to obtain an aqueous solution, the pH value of the aqueous solution at 25 DEG C is pH 1, and the pH 1 is 6-8. Comprising the silicon-carbon negative electrode material disclosed by the invention has the advantages that the expansion rate is improved, and the rate capability and the cycle performance are improved.

The present invention belongs to the technical field of the preparation of modified isocyanates, and particularly relates to a modified isocyanate, a preparation method thereof and an application; the modified isocyanate comprises: 70-94 parts of an organic isocyanate; 6-30 parts of polyether polyol i; the polyether polyol i is a polyether polyol randomly copolymerized with EO / PO monomers and capped with EO, or a polyether polyol block copolymerized with PO monomers and capped with EO, or a mixture of the two; the average molecular weight of the polyether polyol i is 2000-10000, the functionality is 2-4, the EO content is 5-29 wt%, the hydroxyl value is 20-80 mgKOH / g, and the primary hydroxyl group content is greater than or equal to 70%. The modified isocyanate of the present invention has good storage stability, and the slow-rebound polyurethane foam prepared therefrom has fine open cells, and has the advantages of high tolerance, good tear performance, and good sound absorption and sound insulation effects.

A protective helmet comprising a helmet shell having at least two layers and the helmet shell having a flexural modulus from 50 MPa to 600 MPa as measured using ASTM D 790 B and a non-foamed specific gravity in the range of 0.916 g / cm3 up to 1.60 g / cm3. More than one helmet shell may be combined to provide greater protection to the wearer. The layers may be constructed of an open cell foam, a waterproof coating layer, a separator layer, a flexible layer, a slightly foamed layer, and a cushion layer. A protective facial barrier may be easily removed with use of a locking mechanism which removably secures the facial barrier to the helmet shell. The helmet shells may also be in parts and hinged so that the parts can separate for easy removal of the protective helmet. An adjustment locking mechanism may also tighten and adjust a second helmet shell.

The present application relates to a kind of composite current collector and its preparation method, belong to secondary battery technical field.The composite current collector provided by the present application has the original structure of sharp cone for shape memory polymer support layer, and the opening of support layer is filled with foaming agent and foaming aid.A kind of composite current collector provided by the present application can reduce weight and improve the energy density of battery.Secondly, the composite current collector provided by the present application increases the heat-sensitive function, which can cut off the electrochemical reaction inside the secondary battery on one hand after the thermal runaway and external impact of battery, and can reduce the heat generation of secondary battery on the other hand when the secondary battery is at high temperature, which has a triple guarantee for the safety performance of battery.

A method of 3D printing a garment can include 3D printing a first filament layer extending in a first direction, and 3D printing a second filament layer over the first filament layer. The second filament layer can extend in a second direction different than the first direction such that the first and second filament layers overlap one another at a plurality of contact points and collectively define a plurality of open cells.

A molten metal filtration apparatus is provided. The apparatus includes a filter chamber having a floor, a metal inlet, a metal outlet, and a wall surface adapted to be partitioned by at least one filter element having an open cell structure characterized by a plurality of interconnected voids. The filter element partitions the filter chamber. At least one heater device is provided at an elevation within the filtration chamber that is equal to or below the filter element.

The utility model provides a supporting column dismounting and mounting structure and a mobile workstation, the supporting column dismounting and mounting structure comprises a mounting base, a pressing and holding part and a locking assembly, and the mounting base can be mounted on a mounting object; one end of the hold-down part is connected to the mounting base, the other end of the hold-down part is provided with a connecting end, and the hold-down part and the mounting base can define a mounting hole; the locking assembly comprises a locking wrench and a connecting part, the connecting end is provided with an open hole, the connecting part can penetrate through the open hole, one end of the connecting part is connected with the mounting base, the other end of the connecting part is movably connected with the locking wrench, and the locking wrench can press the connecting end to move so that the pressing part can press the supporting column in the mounting hole. According to the mobile work station, a user can complete locking and unlocking of the mounting base and the supporting column by pulling tightly or pulling away the locking wrench, operation is easy, and the user can conveniently and rapidly disassemble, assemble and move the work station.

The invention provides an integrated compression molding forming method and system for an energy storage-bearing thin-wall component, and the method comprises the steps: selecting an area within a strain requirement to arrange the distribution of energy storage elements in the component based on forming simulation, reserving open holes in fiber-reinforced resin prepreg according to a design position, and then laying the fiber-reinforced resin prepreg; a plurality of high-temperature-resistant soft package energy storage elements are placed in the notches of the fiber reinforced resin prefabricated body; the positive electrode and the negative electrode of the high-temperature-resistant soft package energy storage element are wrapped by a termination adhesive tape and are led out from a prepreg layer, and then the outer side of the positive electrode and the outer side of the negative electrode are packaged with prepreg and pre-compacted; heating and softening the prefabricated body, putting the prefabricated body into a medium and low temperature component forming mold, heating and pressurizing, and then cooling, so as to integrally form the energy storage-bearing composite material component; and uncovering the termination adhesive tape on the energy storage-bearing composite material component, connecting the positive electrode and the negative electrode of each energy storage element in the component to a battery management system, and carrying out low-current charge-discharge circulation at the rate of 0.1 C to obtain the stable energy storage-bearing integrated component.

The invention relates to the technical field of server heat dissipation, and discloses a fresh air and cold plate type liquid cooling integrated server which comprises a cabinet body, filter cavities are formed in the two sides of the cabinet body, fan frames are symmetrically arranged on one side of the cabinet body, fan frames are fixedly arranged on the inner walls of the fan frames, and a plurality of fan blades are arranged in the middle of the fan frames. The fan frame penetrates through the outer wall of the cabinet body and is arranged in the filtering cavity, a filtering plate is arranged in the filtering cavity of the cabinet body, a plurality of filtering holes are formed in the outer wall of the filtering plate, a plurality of open holes are symmetrically formed in the inner wall of the cabinet body, and the open holes of the cabinet body are provided with screens. Through integration of two modes of fresh air direct air cooling and cold plate type liquid cooling, heat dissipation modes can be flexibly switched according to different environmental conditions and heat dissipation requirements of the server, efficient heat dissipation is achieved, and it is ensured that the internal temperature of the server is always kept within a reasonable range. The problem that the heat dissipation efficiency is poor under different weather conditions is solved.

The invention provides a porous carbon material, a negative electrode material, a manufacturing method of the negative electrode material, a negative electrode, a battery and equipment, the porous carbon material is provided with a plurality of open pores, the open pores are used for loading a silicon material, the plurality of open pores are uniformly distributed in the porous carbon material, and the open pores comprise micropores and mesopores; wherein the mesopores comprise at least one aperture range, and the range of each aperture range is less than or equal to 1nm. The open pores in the porous carbon material are uniformly distributed, the open pores comprise micropores and mesopores with small pore diameter range, and the mesopores can increase the pore volume of the porous carbon material, so that the negative electrode material formed by the open pore loaded silicon material in the porous carbon material has high specific capacity. In addition, a plurality of pores which are formed by the plurality of open pores and are used as reserved spaces for volume expansion of the silicon material are also uniformly distributed in the negative electrode material, and the pore diameter range of the plurality of pores is relatively small, so that the situation that the negative electrode material is broken due to concentrated stress can be avoided, and the structural stability of the negative electrode material is ensured.

The utility model relates to a display panel and a display device. The display panel comprises a display area and a non-display area. The non-display area comprises an open hole and a partition area, the partition area is located between the open hole and the display area, and the partition area surrounds at least part of the open hole. The display panel comprises a substrate layer, a planarization layer is arranged on the substrate layer in the display area, the planarization layer is provided with a first partition structure on the substrate layer in the partition area, and the first partition structure comprises a main top surface, a main bottom surface and a main side surface connected between the main top surface and the main bottom surface, the main top surface and the main bottom surface are opposite in the direction perpendicular to the plane where the display panel is located. The partition area further comprises a reinforcing structure, and the reinforcing structure makes contact with at least part of the side face of the first partition structure and makes contact with the substrate layer. According to the display panel, the reinforcing structures are arranged in the partition areas, and the first partition structures in the partition areas are optimized, so that the binding force of the film layers in the partition areas of the display panel is improved, the stripping problem between the film layers is reduced, and then the stability and reliability of the display surface are effectively improved.

The invention relates to the technical field of vacuum heat insulation materials, and discloses a pored polyurethane vacuum heat insulation panel and a preparation method thereof.The pored polyurethane vacuum heat insulation panel comprises a blocking layer and a core material, the blocking layer is arranged outside the vacuum heat insulation panel and sequentially comprises a protection layer, a cellulose base layer and a heat sealing layer from outside to inside, and the core material is arranged inside the vacuum heat insulation panel and located in the blocking layer; the core material takes open-cell polyurethane foam as a matrix, a nano-scale flame retardant and reinforced fibers are added to form a micropore open-cell structure, the protective layer is used for providing mechanical strength and puncture resistance, the cellulose base layer is used for blocking gas permeation, and the heat sealing layer is used for ensuring sealing performance. The perforated polyurethane vacuum insulation panel is stable in performance, good in heat insulation performance, low in gas permeability, low in water absorption performance and good in mechanical strength and durability, the service life of the vacuum insulation panel is prolonged through combination of the blocking layer and the core material, and the maintenance cost is reduced.

Child safety seat (1) for a vehicle (30) comprising a frame (2) shaped so as to accommodate a child (40) in a child area (3), the frame (2) comprising a sitting portion (2A), a backrest portion (2B) and side portions (2C); at least one impact absorbing assembly (4) connected to the frame (2) and comprising: a deformable polymeric layer (5); at least one honeycomb cellular insert (6) associated with the deformable polymeric layer (5). The at least one honeycomb cellular insert (6) comprises a plurality of open cells (7) having longitudinal axes (L) extending out of an inner / outer surface of the frame (2), said cells (7) being configured to absorb energy by plastic deformation in response to a longitudinal compressive load applied to said cells (7); and the deformable polymeric layer (5) is shaped so as to contain the at least one honeycomb cellular insert (6).

Covered stents may be coated with or otherwise include a drug eluting composition. An illustrative stent may comprise an elongated tubular body having a strut framework defining a plurality of open cells. A polymeric coating may be disposed on a surface of the elongated tubular body and extending across the plurality of open cells and a first drug coating composition disposed on a surface of the polymeric coating.

The invention relates to a copper block centering control method and a copper block embedded circuit board. The method comprises the following steps: S1, manufacturing an inner-layer core board; s2, groove hole processing: milling a groove hole in a copper block embedding area of each layer of core plate, wherein the opening size of the groove hole is greater than the boundary dimension of the copper block; flatness identification blocks are symmetrically arranged on the two opposite sides of the slotted hole in the core plate located on the outermost layer; s3, pre-stacking and positioning the core board; s4, embedding and curing of a copper block: embedding the copper block into the aligned slotted holes, enabling the copper block to be located between the two flatness identification blocks, and then performing curing; and S5, press-fit forming. The flatness identification blocks are arranged on the two opposite sides of the groove hole of the core plate on the outermost layer, it is ensured that the copper block is placed in the middle, and an operator can visually judge whether the copper block has obvious displacement or not by observing whether the flatness identification blocks on the two sides are damaged or not, so that defective products can be checked in time.

The invention provides a 2.5 D packaging structure and a preparation method of the 2.5 D packaging structure, and relates to the technical field of chip packaging, the 2.5 D packaging structure comprises a substrate combination wiring layer, a first chip, a film coating layer, a second chip and a plastic packaging layer, the substrate combination wiring layer is provided with a first bonding pad and a second bonding pad, and the middle part of the second bonding pad is provided with an alignment groove; the first chip is attached to the first bonding pad; the film covering layer at least covers the side wall of the first chip, partially covers the second bonding pad and is provided with an open hole for exposing the counterpoint groove; the second chip is attached to the second bonding pad; and the plastic package layer is arranged on the film coating layer. Compared with the prior art, the method has the advantages that the first chip can be independently coated with a film, meanwhile, the hole for exposing the alignment groove is formed through punching, the second chip can be conveniently aligned and attached to the second bonding pad, and the second conductive bulge of the second chip is jointed with the alignment groove to realize electric connection. Therefore, negative problems caused by simultaneous film coating of a plurality of chips are avoided.

This provides an improved dissolvable solid article with a specific aspect ratio. Such dissolvable solid article has a multilayer structure comprising two or more flexible, dissolvable, porous sheets, while each of which comprises a water-soluble polymer and a surfactant and is characterized by a Percent Open Cell Content of from 80% to 100% and an Overall Average Pore Size of from 100 μm to 2000 μm. The multilayer dissolvable solid article is characterized by a maximum dimension D and a minimum dimension z; and wherein the ratio of D / z ranges from 1 to 10.

Exemplary embodiments pertain to a combined shipping and expansion device for shipping a roll of unexpanded slit sheet material and for expanding the slit sheet material. In some examples, the device includes: a container made with recyclable paper or board; a roll of slit sheet material wound around a core member and positioned within the container; the roll of slit sheet material having a slit pattern that forms open cells upon expansion; the core member being made with recyclable paper or board and having a length greater than a width of the roll of slit sheet wound around the core member and having protrusions that extend beyond each side of the roll of slit sheet material; a plurality of yoke members within the container, including at least one yoke member that rotatably receives a first of the protrusions and at least one yoke member that rotatably receives a second of the protrusions; and the container having a dispensing opening through which the slit sheet material wound around the core member can be extended and pulled, causing the core member to rotate relative to the yoke members via rotation of the roll of slit sheet material. The combined shipping and expansion device is made from substantially entirely recyclable paper or board materials, whereby after complete dispensing of the slit sheet material from the shipping and expansion device, the combined shipping and expansion device can be recycled in a paper recycling facility.

The invention relates to the technical field of battery packs, and discloses a battery pack and a power utilization device, and the battery pack comprises a box body, a plurality of battery monomers and a supporting piece; the box body comprises a bottom plate, a frame and a cover plate which are fixedly connected, and the box body is provided with an accommodating cavity; the bottom plate is provided with a first flow channel extending in the first direction, and the cover plate is provided with a second flow channel. The plurality of single batteries are arranged in the accommodating cavity, and gaps are formed between the adjacent single batteries in the first direction; a plurality of first holes are formed in the bottom plate; in the first direction, the opening areas of the first holes are gradually increased and / or the opening number is gradually increased; the supporting piece is arranged in the gap, the orthographic projection of the supporting piece on the bottom plate in the third direction shields part of the gap, the supporting piece divides the gap into a third flow channel, and the third flow channel communicates with the first flow channel, the first hole and the second flow channel. Through the gradual change design of the opening area and / or the opening number of the first holes, the flow velocity of the cooling medium in different areas of the accommodating cavity is more uniform, and the liquid cooling flow uniformity and the overall heat dissipation effect are ensured.

The invention relates to the technical field of sodium ion battery negative electrode materials, in particular to a phenolic resin-based hard carbon sodium ion battery negative electrode material, a negative electrode and a preparation method and application thereof. The crosslinking degree and the main chain rigidity of the phenolic resin are regulated and controlled by regulating the number of benzene rings in side chains of aldehyde molecules, so that the internal space (free volume) of the phenolic resin is influenced, and a rich closed-pore structure is finally formed; then waste gas generated by pyrolysis of phenolic resin is used as a carbon source for chemical vapor deposition, and resin carbon is used as a substrate, so that the pore surface of hard carbon can be effectively sealed, electrolyte permeation is prevented, and open pores in the hard carbon material are converted into closed pore structures to be used as efficient sodium storage sites. Meanwhile, the method also has green sustainability and cycle economy, volatile waste gas generated by pyrolysis is reutilized as a carbon source to be deposited on the surface of resin carbon, the carbon yield is improved, the dynamic performance of the hard carbon material is also improved, and emission of the volatile waste gas is reduced.